2 Answers

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1)Beat the Elite Four. You cannot get Mewtwo until you defeat the Elite Four and become champion.
2)Obtain the National Pokedex from Professor Oak. You will need to have captured sixty Pokemon before he will give it to you.
3)Fix the Network Machine by finding the Ruby and Sapphire (see below).

Get the Ruby.

1)Go to Island 1. You will need a Pokemon who knows Surf to do this.
2)Go to the entrance of Mt. Ember. On the lower right side of the area, you will see some Team Rocket members. You will hear the first password to the Rocket Warehouse. Battle them, and enter the cave.
3)Proceed all the way down to the bottom level. You do not need to read any of the braille charts. You will need a Pokemon with Strength to get through the cave.
4)Pick up the Ruby and exit. You can either use an escape rope, use "Dig" or exit the way you came in.

Get the Sapphire.

1)Go to Island 6 and find the Dotted Hole, which can be seen on the Town Map. At the entrance, read the braille sign. It will say "Cut," so you make sure you bring a Pokemon who knows Cut.
If you have not yet saved Lorelei from Island 4, a scientist will be blocking the way.
2)Inside the cave, look at the braille signs. They will tell you which hole to fall down. If it has 2 symbols, it means go up. If it has 5, then it's right. If it has 4, then it is either left or down. If you mess up, you will have to start over again.
3)On the bottom level, you will see the Sapphire. Don't get too excited; a super nerd will take it first. He will then give you the second password for the Rocket Warehouse.
4)Go to the Rocket Warehouse, found on Island 5. You will need to defeat all the Team Rocket members to get to the boss.
5)In the final room, you will find the super nerd who stole the Sapphire. Battle him. When you beat him, you will get the Sapphire.
6)Travel to Island 1. Give the gems to Celio, the man who operates the machine on the island. He will connect the regions of Kanto and Hoenn by signal and open up the way to Mewtwo.

Finding Mewtwo

1)Go to Cerulean City. At the top left corner of the town, you will see a cave that is now open. Travel north to Route 24 and use a Pokemon to Surf to the entrance.
2)Inside the cave, you will need to navigate the maze to the bottom floor. Make sure your Pokemon team is at a high level; there are a lot of strong Pokemon here (levels 46-70).
3)At the end, you will see Mewtwo. Save your game before battling him, as this is your only chance to catch him and he is very powerful. See the Tips section for some methods of catching Mewtwo.

Step 1: Beat the Elite 4
Step 2: Obtain the national dex
Step 3: Find and fix the network machine by finding the ruby and sapphire stones (You must search through islands 1 and 6 in order to find the ruby and sapphire, once you have it all return to island 1) (Hope This Helps!) :)